I was with a 5 man squad in Cherno, and whilst we were in the town square with the statue, we ALL crashed, after joining again, we all crashed again, and again.
I have AMD cards with the 13.12 driver, windows 8.1 64 bits
Another two also AMD card with windows 7 64 bits
One of us has a Nvidia card, Titan.
We noticed the server was kind of laggy, that could have been a possible cause perhaps, we joined for the 4th time and we managed to get out of cherno without crashes.